The first one looks like std AT transaxel? (In looking at trans code charts it looks like all Karmann Ghias came with 3.875 R&P --- https://www.limebug.com/how-to-guides/view/32 
Rev. | 1st | 2nd | 3rd | 4th | Ring & Pinion | Overall in 4th |
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'73-'77 (AT) | 3.79 | 3.78 | 2.06 | 1.26(b) | 0.93(b) | 3.875 | 3.60 |
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